论文标题
单层CRCL $ _3 $作为2D磁性通用类别的理想测试床
Monolayer CrCl$_3$ as an ideal Test Bed for the Universality Classes of 2D Magnetism
论文作者
论文摘要
单层HALIDE CRX $ _3 $（X = Cl，Br，i）引起了极大的关注，以实现具有真正的长距离顺序（LRO）的2D磁铁，从而挑战了Mermin-Wagner定理。在这里，我们表明单层CRCL $ _3 $具有独特的好处，即在施加压缩应变时表现出可调磁各向异性。这打开了使用Crcl $ _3 $来生产和研究铁磁和反铁磁2D ising-type lro的可能性，以及berezinskii-kosterlitz-thouless-thouless（bkt）与Quasi-lro的2D磁性策略。使用最先进的密度功能理论，我们解释了如何使用逼真的压缩应变来调整单层磁性特性，从而可以表现出任何这些相。在大规模量子蒙特卡洛模拟的基础上，我们计算了紧张的crcl $ _3 $的相图，以及带有自旋波理论的镁谱。我们的结果强调了单层CRCL $ _3 $的显着适合性，以达到非常高的BKT过渡温度，约50 K，这是由于它们对材料的弱易于平面各向异性的唯一依赖性。
The monolayer halides CrX$_3$ (X=Cl, Br, I) attract significant attention for realizing 2D magnets with genuine long-range order (LRO), challenging the Mermin-Wagner theorem. Here, we show that monolayer CrCl$_3$ has the unique benefit of exhibiting tunable magnetic anisotropy upon applying a compressive strain. This opens the possibility to use CrCl$_3$ for producing and studying both ferromagnetic and antiferromagnetic 2D Ising-type LRO as well as the Berezinskii-Kosterlitz-Thouless (BKT) regime of 2D magnetism with quasi-LRO. Using state-of-the-art density functional theory, we explain how realistic compressive strain could be used to tune the monolayer's magnetic properties so that it could exhibit any of these phases. Building on large-scale quantum Monte Carlo simulations, we compute the phase diagram of strained CrCl$_3$, as well as the magnon spectrum with spin-wave theory. Our results highlight the eminent suitability of monolayer CrCl$_3$ to achieve very high BKT transition temperatures, around 50 K, due to their singular dependence on the weak easy-plane anisotropy of the material.
